Validation of viewstate MAC failed.Application hosted by a Web Farm, ensure configuration

net 4.0 frame work,
I had made many website in this frame work but never get such error

 "Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster."

I think so this error is caused because of use of cookies as only in this website i had made use of cookies.

Another one thing i used to get this error very rarely almost 2twice a week

I had read many solutions for this but very rarer for 4.0

solution readed such as putting

<machineKey validationKey="6628ECBFB40F6F852AB543C23C0B83C1679C5AAE35AD72FACF5B9F4FDB70AA1F648A1D5877CE1F9D69F08BAD919BFBAC0976D9119B8F32CFB80814E4E943F8EE" decryptionKey="42F45B378301126EB4CCBA16995304263754EF116E08A81003A936CC04B7537F" validation="SHA1" decryption="AES" />

in web config
OR Adding

<pages validateRequest="false" enableEventValidation="false" viewStateEncryptionMode ="Never" />

in webconfig

But where should i add in my above web config

<?xml version="1.0"?>
<configuration>
  <connectionStrings>
<add name="Conn" connectionString="Data Source=abc; Initial Catalog=alfadesi_trikon;User ID=abc;Password=abc" providerName="System.Data.SqlClient"/>
</connectionStrings>
<system.web>
<globalization culture="en-AU" uiCulture="en-AU" />
    <compilation debug="true" targetFramework="4.0"/>
<authentication mode="Windows"/>
<customErrors mode="Off"></customErrors>    
</system.web>
</configuration>

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Answers:

Method 1

Answers:

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Method 1

you can add your machine key in system.web element.
for e.g.

<system.web>
<machineKey validationKey="1234567890123456789012345678901234567890AAAAAAAAAA"
 decryptionKey="123456789012345678901234567890123456789012345678"
 validation="SHA1" decryption="Auto" />
</system.web>

If you don’t want to put a machinekey in the web.config for each application, you need to put it in machine level web.config for each .Net Framework version.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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